chore: todos for refactor multiball childrens

lib/game/components/controlled_multiball.dart

@@ -31,11 +31,16 @@ class MultiballGroup extends Component
   Future<void> onLoad() async {
     await super.onLoad();
 
+    multiballA = Multiball.a();
+    multiballB = Multiball.b();
+    multiballC = Multiball.c();
+    multiballD = Multiball.d();
+
     await addAll([
-      multiballA = Multiball.a(),
-      multiballB = Multiball.b(),
-      multiballC = Multiball.c(),
-      multiballD = Multiball.d(),
+      multiballA,
+      multiballB,
+      multiballC,
+      multiballD,
     ]);
   }
 }
@@ -60,6 +65,9 @@ class MultiballController extends ComponentController<MultiballGroup>
     final hasMultiball = state.bonusHistory.contains(GameBonus.dashNest);
 
     if (hasMultiball) {
+      // TODO(ruimiguel): change to animate every children without different
+      // properties using component.children.whereType<Multiball>().forEach
+      // once able to mock the children ComponentSet.
       component.multiballA.animate();
       component.multiballB.animate();
       component.multiballC.animate();

test/game/components/controlled_multiball_test.dart

@@ -1,5 +1,6 @@
 // ignore_for_file: cascade_invocations
 
+import 'package:flame/components.dart';
 import 'package:flame_test/flame_test.dart';
 import 'package:flutter_test/flutter_test.dart';
 import 'package:mocktail/mocktail.dart';
@@ -89,21 +90,35 @@ void main() {
           flameTester.test(
             'blink multiballs when state changes',
             (game) async {
+              // TODO(ruimiguel): search how to mock MultiballGroup children
+              // ComponentSet to improve this test.
               final multiballGroup = MockMultiballGroup();
-              final multiball = MockMultiball();
+              final multiballA = MockMultiball();
+              final multiballB = MockMultiball();
+              final multiballC = MockMultiball();
+              final multiballD = MockMultiball();
               final controller = MultiballController(multiballGroup);
-              when(() => multiballGroup.multiballA).thenReturn(multiball);
-              when(() => multiballGroup.multiballB).thenReturn(multiball);
-              when(() => multiballGroup.multiballC).thenReturn(multiball);
-              when(() => multiballGroup.multiballD).thenReturn(multiball);
-              when(multiball.animate).thenAnswer((_) async => () {});
+              when(() => multiballGroup.multiballA).thenReturn(multiballA);
+              when(() => multiballGroup.multiballB).thenReturn(multiballB);
+              when(() => multiballGroup.multiballC).thenReturn(multiballC);
+              when(() => multiballGroup.multiballD).thenReturn(multiballD);
+              when(() => multiballGroup.children).thenReturn(
+                {multiballA} as ComponentSet,
+              );
+              when(multiballA.animate).thenAnswer((_) async => () {});
+              when(multiballB.animate).thenAnswer((_) async => () {});
+              when(multiballC.animate).thenAnswer((_) async => () {});
+              when(multiballD.animate).thenAnswer((_) async => () {});
 
               controller.onNewState(
                 const GameState.initial()
                     .copyWith(bonusHistory: [GameBonus.dashNest]),
               );
 
-              verify(() => multiball.animate).called(4);
+              verify(multiballA.animate).called(1);
+              verify(multiballB.animate).called(1);
+              verify(multiballC.animate).called(1);
+              verify(multiballD.animate).called(1);
             },
           );
         },